Hey y'all, I'm stoked to have found this community and am reading tons of information. I'm wondering what I should do to treat a moderate black algae problem in my mom's pool. The pool is currently being drained and will be refilled ASAP, but what should I do while the pool is empty to fight the black algae? Pressure wash? Scrub? Acid wash? Chlorine wash? The pool is old but in good shape generally. I plan on taking control over the chemicals and learning the TFP methods once the pool is filled. But what should I do while I have the pool empty if anything? Thanks!!